The text says:
A new factory in Spain that produces €100 m worth of products per year would require €500 m investment. The same factory in China would cost €300 m.
From this part you can assume that you are now evaluating to build a new factory in China, investing 300M€, that produces 100M€ worth of products per year.
The total market in China is composed by:
- Pregnant women market: 225M€
- Sick patients market: 660M€
The total market is then 885M€. If you want to know what would be your coverage with the new plan, you have to calculate: Production/Total Market=100M€ / 885M€= 11.3%
Hope it helps,